ESDU 86002
Drag and pressure recovery characteristics of auxiliary air inlets at subsonic speeds.
Abstract:
ESDU 86002 provides methods for estimating the drag and pressure recovery of intakes partially or wholly immersed in the boundary layer. The methods, which are semiempirical, apply to circular, semicircular or rectangular scoop intakes, with or without boundary layer diverter, and flush rectangular intakes having a shallow entrance ramp of rectangular or NACA curveddivergent planform. The effect of throat just aft of the lip is derived from theoretical calculations taking account of the velocity profile. Empirical methods, based on a limited database, predicted spillage drag and, for scoop intakes, the contribution from profile drag.Indexed under:
 Boundary Layer
 Boundary Layer Diverter
 Drag
 Intakes
 NACA Convergentdivergent Planform Flush Intakes
 Pressure Recovery
 Ram Efficiency
 Spillage Drag
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Data Item ESDU 86002  

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This Data Item contains 33 interactive graph(s) as listed below.
Graph  Title 

Figure 1  Part 1  Mass flow ratio 
Figure 1  Part 2  Mass flow ratio 
Figure 2  Part 1  Momentum flow ratio 
Figure 2  Part 2  Momentum flow ratio 
Figure 3  Part 1  Total pressure recovery 
Figure 3  Part 2  Total pressure recovery 
Figure 4  Part 1  Ram pressure efficiency 
Figure 4  Part 2  Ram pressure efficiency 
Figure 5  Datum drag coefficient at full mass flow for scoop inlets 
Figure 6a  Spillage drag at zero mass flow for sharplip scoop inlets  basic data 
Figure 6b  Spillage drag at zero mass flow for sharplip scoop inlets  trend with w^{2}/A_{1} 
Figure 7a  Factor for spillage drag variation with mass flow ratio for scoop inlets  basic data for circular inlets 
Figure 7b  Factor for spillage drag variation with mass flow ratio for scoop inlets  basic data for semicircular inlets and rectangular inlets with w^{2}/A_{1} ≥ 4 
Figure 7c  Factor for spillage drag variation with mass flow ratio for scoop inlets  trend with w^{2}/A_{1} 
Figure 8a  Factor for effect of profile of scoop fairing forebody on spillage drag  M ≥ 0.6. Elliptical or NACA1 series profile 
Figure 8b  Factor for effect of profile of scoop fairing forebody on spillage drag  M = 0.2. Elliptical or NACA1 series profile 
Figure 8c  Factor for effect of profile of scoop fairing forebody on spillage drag  all M. Sharp lip and linear profiles 
Figure 9  Factor allowing for variation of delta P _{Ht} / P _{H0} with mach number for scoop inlets 
Figure 10a  Factor on momentum flow ratio to allow for ramp planform and lip shape for flush inlets  round lip and rectangular or curveddivergent ramp. Sharp lip and rectangular ramp 
Figure 10b  Factor on momentum flow ratio to allow for ramp planform and lip shape for flush inlets. Sharp lip and curveddivergent ramp. 
Figure 11  Drag coefficient at zero mass flow for flush inlets 
Figure 12  Effect of ramp angle on C'_{Dfl} for flush inlets 
Figure 13  Effect of Mach number on C'_{Dfl} for flush inlets 
Figure 14  Factor for spillage drag variation with mass flow ratio for flush inlets 
Figure 15a  Incremental drag coefficient correction for flush inlets  rectangular ramp 
Figure 15b  Incremental drag coefficient correction for flush inlets  curveddivergent ramp 
Figure 16  Factor on ram pressure efficiency due to mass flow ratio for flush inlets with rectangular ramp 
Figure 17  Maximum ram pressure efficiency for flush inlets with curveddivergent ramp 
Figure 18  Mass flow ratio for maximum ram pressure efficiency for flush inlet with curveddivergent ramp 
Figure 19a  Incremental corrections to maximum ram pressure efficiency for flush inlets with a curveddivergent ramp  effect of mass flow ratio 
Figure 19b  Incremental corrections to maximum ram pressure efficiency for flush inlets with a curveddivergent ramp  effect of effect of ramp angle 
Figure 19c  Incremental corrections to maximum ram pressure efficiency for flush inlets with a curveddivergent ramp  effect of aspect ratio 
Figure 20  Modified mass flow parameter for sizing flush inlets with a curveddivergent ramp operating at maximum ram pressure efficiency 
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